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a.
\(4P+5O_2\underrightarrow{t^o}2P_2O_5\)
b.
\(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)
c.
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
d.
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{39}{65}=0,6\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{Zn}=1,2\left(mol\right)\Rightarrow m_{HCl}=1,2.36,5=43,8\left(g\right)\)
c, \(n_{H_2}=n_{Zn}=0,6\left(mol\right)\Rightarrow V_{H_2}=0,6.24,79=14,874\left(l\right)\)
d, - Quỳ tím hóa đỏ do HCl dư.
a.
\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)
b.
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
c.
\(2KMnO_4\underrightarrow{p.h}K_2MnO_4+MnO_2+O_2\)
\(a.2Na+2H_2O\rightarrow2NaOH+H_2\\ b.n_{Na}=\dfrac{9,2}{23}=0,4\left(mol\right)\\ n_{H_2}=\dfrac{1}{2}n_{Na}=0,2\left(mol\right)\\ \Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\\ n_{NaOH}=n_{Na}=0,4\left(mol\right)\\ \Rightarrow m_{NaOH}=0,4.40=16\left(g\right)\\ c.H_2+CuO-^{t^o}\rightarrow Cu+H_2O\\ n_{CuO}=\dfrac{12}{80}=0,15\left(mol\right)\\ LTL:\dfrac{0,2}{1}>\dfrac{0,15}{1}\Rightarrow H_2dưsauphảnứng\\ n_{H_2\left(pứ\right)}=n_{CuO}=0,15\left(mol\right)\\ \Rightarrow n_{H_2\left(dư\right)}=0,2-0,15=0,05\left(mol\right)\\ \Rightarrow m_{H_2\left(Dư\right)}=0,05.2=0,1\left(g\right)\)
a, Ta có:
nZn = 13/65= 0,2(mol)
PTHH: Zn + H2SO4 → ZnSO4 + H2
0,2-----------------------------------0,2
Theo PT : nZnSO4 = 0,2.1/1 = 0,2(mol)
mZnSO4 = 0,2. 161 = 32,2(g)
b, Ta có:
Theo PT : nH2 = 0,2.1/1 = 0,2(mol)
VH2(đktc) = 0,2 . 22,4 = 4,48(l)
CuO+H2-to>Cu+H2O
0,2-----0,2
=>m Cu=0,2.64=12,8g
Cậu ơi cho tớ hỏi ngu tý là cái mà "0,2---------0,2" là ntn vậy ạ :"))?
\(n_{ZnO}=\dfrac{m}{M}=\dfrac{16,2}{65+16}=0,2\left(mol\right)\)
a) \(PTHH:Zn+H_2O\rightarrow ZnO+H_2\)
1 1 1 1
0,2 0,2 0,2 0,2
b) \(V_{H_2}=n.24,79=0,2.24,79=4,958\left(l\right)\)
c) \(m_{Zn}=n.M=0,2.65=13\left(g\right).\)
nH2SO4 = 49/98 = 0.5 (mol)
CMH2SO4 = 0.5/0.15 = 3.3 (M)
Zn + H2SO4 => ZnSO4 + H2
...........0.5.............0.5.........0.5
VH2 = 0.5 * 22.4 = 11.2 (l)
CMZnSO4 = 0.5 / 0.15 = 10/3 (M)
C%ZnSO4 = CM*M / 10D = 10/3 * 161 / 10 * 1.25 = 42.9 %
\(n_{HCl}=\dfrac{7,3}{36,5}=0,2\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
0,1<---0,2------>0,1--->0,1
=> mZn = 0,1.65 = 6,5(g)
=> VH2 = 0,1.22,4 = 2,24(l)
=> mZnCl2 = 0,1.136 = 13,6(g)
1) \(2KClO_3\rightarrow2KCl+3O_2\)
2)
a) \(CuO+H_2\xrightarrow[]{t^o}Cu+H_2O\)
b) \(2Na+2H_2O\rightarrow2NaOH+H_2\)
c) \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
1) 2KClO3 --to--> 2KCl + 3O2
2a) CuO + H2 --to--> Cu + H2O
b) 2Na + 2H2O ----> 2NaOH + H2
c) Zn + H2SO4 ----> ZnSO4 + H2